Getting your goods from Amazon is now as simple as letting the deliveryman pop the trunk -- if you're OK with that.After an early access period, the massive online retailer announced Tuesday that its free Amazon Key service is now available to Prime members with properly equipped vehicles.How it works: Customers link their Amazon account with their car service accounts, such as OnStar, and download the Amazon Key app.When completing an Amazon order, they select the in-car delivery option.To receive the order, customers park within two blocks of their selected address during a specific time frame. The delivery driver is then given access to the customer's car before making the delivery.Customers will receive updates on the deliveries during every step of the process.In a release, Amazon said 7 million OnStar-enabled General Motors vehicles are eligible for the service and more makes and models will be added.The service gives a welcome way to avoid the problem of "porch pirates," said Matt McFarland, a CNN Money reporter who tried out the service."In a local Facebook group, my frustrated neighbors regularly post videos of their packages being stolen -- their doorbell cameras don't seem to deter theft. Rather than risk losing a package, my wife and I generally get packages delivered to family members who live elsewhere."For city residents like myself, the promise of in-car delivery is a game changer. When I returned home to my car parked on a nearby street, the package was safely waiting for me."Amazon Key already is available for homes, with the ability to watch the deliveries using security cameras -- a service with a yearly fee and some critics."I believe this 'service' is a Trojan horse to enter the home security market," security analyst Micharl Pachter said in October 2017. "If Amazon can convince 10% of its estimated 55 million U.S. Prime members to buy a camera and sign up for a home security , it will generate well over $1 billion in revenue initially. It could conceivably generate another $500 million or more annually in service revenue."

Getting your goods from Amazon is now as simple as letting the deliveryman pop the trunk -- if you're OK with that.

After an early access period, the massive online retailer announced Tuesday that its free Amazon Key service is now available to Prime members with properly equipped vehicles.

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How it works:

Customers link their Amazon account with their car service accounts, such as OnStar, and download the Amazon Key app.

When completing an Amazon order, they select the in-car delivery option.

To receive the order, customers park within two blocks of their selected address during a specific time frame. The delivery driver is then given access to the customer's car before making the delivery.

Customers will receive updates on the deliveries during every step of the process.

In a release, Amazon said 7 million OnStar-enabled General Motors vehicles are eligible for the service and more makes and models will be added.

The service gives a welcome way to avoid the problem of "porch pirates," said Matt McFarland, a CNN Money reporter who tried out the service.

"In a local Facebook group, my frustrated neighbors regularly post videos of their packages being stolen -- their doorbell cameras don't seem to deter theft. Rather than risk losing a package, my wife and I generally get packages delivered to family members who live elsewhere.

"For city residents like myself, the promise of in-car delivery is a game changer. When I returned home to my car parked on a nearby street, the package was safely waiting for me."

Amazon Key already is available for homes, with the ability to watch the deliveries using security cameras -- a service with a yearly fee and some critics.

"I believe this 'service' is a Trojan horse to enter the home security market," security analyst Micharl Pachter said in October 2017. "If Amazon can convince 10% of its estimated 55 million U.S. Prime members to buy a camera and sign up for a home security [system], it will generate well over $1 billion in revenue initially. It could conceivably generate another $500 million or more annually in service revenue."